EP2323577B1 - Softgenerator - Google Patents

Softgenerator Download PDF

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Publication number
EP2323577B1
EP2323577B1 EP09777871.6A EP09777871A EP2323577B1 EP 2323577 B1 EP2323577 B1 EP 2323577B1 EP 09777871 A EP09777871 A EP 09777871A EP 2323577 B1 EP2323577 B1 EP 2323577B1
Authority
EP
European Patent Office
Prior art keywords
output
stage
capacitance
input
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09777871.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2323577A1 (de
Inventor
Heiko Schall
Florian Eisele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Erbe Elecktromedizin GmbH
Original Assignee
Erbe Elecktromedizin GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE200810055820 external-priority patent/DE102008055820B3/de
Application filed by Erbe Elecktromedizin GmbH filed Critical Erbe Elecktromedizin GmbH
Publication of EP2323577A1 publication Critical patent/EP2323577A1/de
Application granted granted Critical
Publication of EP2323577B1 publication Critical patent/EP2323577B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206—Generators therefor
    • A61B18/1233—Generators therefor with circuits for assuring patient safety
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00696—Controlled or regulated parameters
    • A61B2018/00702—Power or energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00892—Voltage

Definitions

  • the invention relates to an RF-surgery generator for generating high-efficiency output power according to the preamble of claim 1 having a first stage for generating an RF power coupled to a second stage, the second stage having an input (A, B). and an output (C, D), and wherein there is a series resonance circuit between the input (A, B) and the output (C, D) of the second stage.
  • Fig. 4a and Fig. 5a show various known from the prior art topologies of resonant circuits, as they are used to generate RF power. In these cases, it is possible to integrate a (scattered) transformer for an additional resistance-independent impedance transformation through the structure Lp, L 2 .
  • Fig. 4b, c and Fig. 5b, c show the belonging to the respective topology curves of the resonant frequency f r , the filter input resistance RE, and the maximum output power P a, max and - voltage U a, max as a function of the load resistance RL.
  • the latter two are additionally dependent on the type of feed.
  • the power supply operates in the current limit and for RE> REopt in the voltage limit.
  • SRK series resonant circuit
  • PRK parallel resonant circuit
  • SR series resonances
  • PR parallel resonances
  • c series resonances with a broken line and parallel resonances with a solid line.
  • Fig. 4b and 5b in each case all possible resonance points for the filter, but only the actually occurring at the selected type of frequency feedback operating frequencies are shown by a solid line. Only for these frequencies are in the Fig. 4c and 5c the filter input resistance RE with a solid line and the maximum output power P a, max with a broken line and the maximum output peak voltage U amaxp shown with dash-dotted line.
  • the branching as shown here, then takes place exactly at a point when the resonant frequencies of the individual resonant circuits match.
  • the Fig. 4a shows a known from the prior art resonant circuit for generating output power with a lying at the input A, B parallel resonant circuit (PRK) consisting of a capacitance C p and an inductance Lp, a series resonant circuit having an inductance L 2 and capacitance C 2 and a load R L at output C, D.
  • PRK parallel resonant circuit
  • Fig. 5a shows a known from the prior art resonant circuit for generating output power with a lying at the input A, B series resonant circuit SRK consisting of an inductor L 1 and a capacitor C 1 , a parallel resonant circuit PRK with a capacitance C p and an inductance L p , a Series resonant circuit SRK with an inductance L 2 and capacitance C 2 and a load R L at the output C, D.
  • WO96 / 39085A1 discloses the preamble of claim 1.
  • the present invention is therefore based on the object, an RF generator for generating output power in such a way that the known from the prior art and discussed above problems and disadvantages and in particular a high RF power output with high efficiency in the largest possible load resistance range can be achieved at the same time good EMC properties.
  • an RF generator of the type mentioned above in that in parallel to the input (A, B) an inductance (Lp) and parallel to the output (C, D), a capacitance (Cp) are connected, so in that the HF generator can be operated in resonance over a wide load resistance range.
  • An essential point of the invention is that due to the parallel inductance at the input the effect of an otherwise usually used in their place parallel resonant circuit (PRK) and thus the splitting of the resonances at a certain operating frequency is prevented and that the capacitance connected in parallel to the output is, a series resonance ensured over a wide load resistance range.
  • PRK parallel resonant circuit
  • the output capacitance C p has a capacitance which is large in magnitude compared to the capacitance of a capacitor C 2 of the series resonant circuit. This dimensioning allows the generator frequency to have only a small dependence on the load resistance. Because of the magnitude variable output capacitance C p with respect to occur in practice, capacitive loads, such as caused for example by output lines or endoscopes, in particular also occurs no significant dependence of the RF generator characteristics at different capacitive loads.
  • the first stage generates a square-wave voltage whose phase position is synchronized with an input current flowing into the input (A, B) of the second stage. This ensures that the HF generator in the selected load resistance range can be operated in resonance and a zero voltage and zero current switching (ZVS and ZCS) of the power semiconductors is ensured by a minimum inductive detuning.
  • the phase synchronization can be realized in a simple manner with a PLL circuit.
  • the HF-surgery generator has a voltage regulator for monitoring an output voltage U A at the output (C, D) of the second stage. Because especially for large load resistors, the maximum output voltage rises sharply, which must be prevented by an appropriate circuitry. One, but not limited, possibility is to reduce the power supply voltage accordingly.
  • the voltage regulator can thus be used to control a power supply that supplies the first stage.
  • an overvoltage protection device which may be designed as a varistor, is inserted between the point of connection of L 2 and C 2 and the patient mass (D or B). In this way, care is taken to ensure that the output voltage U A is limited to uncritical values until a regulator intervention takes effect in the event of a sudden load drop for protection against overvoltage.
  • a surgical system is provided with an RF surgery generator with a surgical tissue treatment device, which represents a load (R L ) with a capacitive component, which is applied to the output (C, D) of the second stage.
  • the capacitance of the output capacitor (Cp) is in terms of magnitude large compared to the capacitive component of the load (R L ).
  • Fig. 1a shows a resonant circuit according to the present invention with an input at the input A, B parallel inductance L p , a series resonant circuit SRK with an inductance L 2 and capacitance C 2 and a parallel output C, D capacitance C p and a load R L.
  • the in the Fig. 1a shown topology has a continuous series resonance whose load dependence can be kept low when C p >> C 2 is selected.
  • This embodiment of the resonant circuit can be operated in resonance, for example, by a square-wave voltage generated with a half or full bridge whose phase position is synchronized with the filter input current, in the entire load resistance range.
  • Zero voltage and zero current switching (ZVS and ZCS) of the power semiconductors is ensured by minimally inductive detuning.
  • the phase synchronization can be easily realized with a PLL circuit.
  • a direct feedback of the current signal to the driving of the resonance operation is ensured.
  • Symmetrical, continuous control generates an output signal with a very low degree of distortion. This allows the evaluation of harmonics as a measure of tissue properties and to ensure a high process quality.
  • Fig. 2 shows an embodiment of an RF generator according to the invention.
  • This consists of a power supply 7 and a first stage 2, which is coupled to a second stage 3.
  • the first stage 2 has in the illustrated embodiment, a driver stage 9, which is designed as a full bridge and generates a square wave voltage and a PLL circuit 11 for phase synchronization of the generated by the driver stage square-wave voltage with an input current I rk on.
  • the second stage 3 has an input A, B and an output C, D, wherein between the input A, B and the output C, D of the second stage 3, a series resonance circuit 4 with an inductance L 2 (200 ⁇ H) and a capacitance C 2 (1 nF).
  • an overvoltage protection device 8 with an overvoltage protection for voltages up to 1 kV, which may be formed for example as a varistor.
  • the output voltage U A at the output C, D is monitored.
  • the overvoltage protection 8 limits the output voltage U A until a regulator intervention takes effect on uncritical values.
  • the embodiment shown provides that the voltage regulator 6 regulates the power supply unit 7 via the fed-back output voltage U A, which supplies the first stage 2.
  • Fig. 3a and Fig. 3b each show the resonance frequency characteristic and the output characteristic of the in Fig. 2 illustrated HF generator.

Landscapes

  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Otolaryngology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Inverter Devices (AREA)
  • Surgical Instruments (AREA)
  • Control Of Eletrric Generators (AREA)
EP09777871.6A 2008-09-08 2009-08-13 Softgenerator Not-in-force EP2323577B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008046248 2008-09-08
DE200810055820 DE102008055820B3 (de) 2008-11-04 2008-11-04 Softgenerator
PCT/EP2009/005889 WO2010025815A1 (de) 2008-09-08 2009-08-13 Softgenerator

Publications (2)

Publication Number Publication Date
EP2323577A1 EP2323577A1 (de) 2011-05-25
EP2323577B1 true EP2323577B1 (de) 2016-04-20

Family

ID=41343468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09777871.6A Not-in-force EP2323577B1 (de) 2008-09-08 2009-08-13 Softgenerator

Country Status (6)

Country Link
US (1) US9144451B2 (enExample)
EP (1) EP2323577B1 (enExample)
JP (1) JP5675616B2 (enExample)
CN (1) CN102149346B (enExample)
PL (1) PL2323577T3 (enExample)
WO (1) WO2010025815A1 (enExample)

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* Cited by examiner, † Cited by third party
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ES2308938B1 (es) * 2007-06-20 2010-01-08 Indiba, S.A. "circuito para dispositivos de radiofrecuencia aplicables a los tejidos vivos y dispositivo que lo contiene".
DE102008039884A1 (de) * 2008-08-27 2010-03-04 Erbe Elektromedizin Gmbh Elektrochirurgischer HF-Generator
US9144455B2 (en) 2010-06-07 2015-09-29 Just Right Surgical, Llc Low power tissue sealing device and method
US9039694B2 (en) 2010-10-22 2015-05-26 Just Right Surgical, Llc RF generator system for surgical vessel sealing
US9099863B2 (en) * 2011-09-09 2015-08-04 Covidien Lp Surgical generator and related method for mitigating overcurrent conditions
US10765471B2 (en) 2016-04-15 2020-09-08 Bolder Surgical, Llc Electrosurgical sealer and divider
JP6161862B1 (ja) 2016-08-10 2017-07-12 オリンパス株式会社 電気手術器具のための高周波発生器
US11497543B2 (en) 2017-04-28 2022-11-15 Stryker Corporation Control console and accessories for RF nerve ablation and methods of operating the same
US10170974B1 (en) 2017-07-28 2019-01-01 Apple Inc. Variable frequency and burst mode operation of primary resonant flyback converters
US10707699B2 (en) 2017-09-28 2020-07-07 Apple Inc. Interphase transformer based rectifier for wireless power transfer
EP3858399A1 (en) 2020-01-31 2021-08-04 ECP Entwicklungsgesellschaft mbH Intravascular blood pump
CN113219277A (zh) * 2021-04-16 2021-08-06 唐山不锈钢有限责任公司 一种采用电机电流检测辊道轴承劣化的方法
US12301118B2 (en) 2022-02-28 2025-05-13 Apple Inc. Forward mode soft switching power converter
CN115177362B (zh) * 2022-09-13 2022-12-06 北京杰西慧中科技股份有限公司 高频电刀功率自动调节控制装置

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US20050099827A1 (en) * 2003-11-11 2005-05-12 Hitachi Ltd. Resonant converter and control method thereof

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DE3708801C2 (de) * 1987-03-18 1996-03-14 Medtronic Medizinisch Elektron Zahnärztliches Behandlungsgerät
DE3904558C2 (de) 1989-02-15 1997-09-18 Lindenmeier Heinz Automatisch leistungsgeregelter Hochfrequenzgenerator für die Hochfrequenz-Chirurgie
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US6565558B1 (en) * 1998-09-01 2003-05-20 Heinz Lindenmeier High-frequency device for generating a plasma arc for the treatment of biological tissue
US20050099827A1 (en) * 2003-11-11 2005-05-12 Hitachi Ltd. Resonant converter and control method thereof

Also Published As

Publication number Publication date
WO2010025815A1 (de) 2010-03-11
US9144451B2 (en) 2015-09-29
JP2012501697A (ja) 2012-01-26
US20110172656A1 (en) 2011-07-14
CN102149346B (zh) 2013-12-04
EP2323577A1 (de) 2011-05-25
JP5675616B2 (ja) 2015-02-25
CN102149346A (zh) 2011-08-10
PL2323577T3 (pl) 2016-10-31

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